Update readme.

Author: daniel-cintra

README.md

@@ -140,6 +140,10 @@ You can find the Modular Demo App at [https://demo.ismodular.com](https://demo.i
 
 And the repository for the demo app at [https://github.com/daniel-cintra/modular-demo](https://github.com/daniel-cintra/modular-demo).
 
+## Contributing
+
+Please read and understand the [Contribution Guide](/CONTRIBUTING.md) before creating an issue or pull request.
+
 ## License
 
 The Modular Project is open-source software licensed under the [MIT license](LICENSE.md).